MCANDREW, Bruce A. The sigillography of the Ragman Roll. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 129, p. 663–752, 2000. DOI: 10.9750/PSAS.129.663.752. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/10060. Acesso em: 17 may. 2024.